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• I want use ffmpeg record mp3 in command line but get Unknown input format : 'oss' error

  28 décembre 2012, par user504909

  my ffmpeg version is :

  ffmpeg version N-48238-g10a3fa8 Copyright (c) 2000-2012 the FFmpeg developers
  
  built on Dec 27 2012 16:14:07 with gcc 4.7.2 (GCC)

  use cmd in windows :

  ffmpeg.exe -f oss -i dsp.mp3

  output :

  libavutil      52. 12.100 / 52. 12.100
  
  libavcodec     54. 81.100 / 54. 81.100
  
  libavformat    54. 50.102 / 54. 50.102
  
  libavdevice    54.  3.102 / 54.  3.102
  
  libavfilter     3. 30.101 /  3. 30.101
  
  libswscale      2.  1.103 /  2.  1.103
  
  libswresample   0. 17.102 /  0. 17.102
  
  libpostproc    52.  2.100 / 52.  2.100
  
  Unknown input format: 'oss'

  list all format for "output" :

  ffmpeg.exe -formats | grep "output"

  (I installed the cygwin, so can use grep in window command)
  output :

   E caca            caca (color ASCII art) output device
  
  DE rtp             RTP output
  
  DE rtsp            RTSP output
  
  DE sap             SAP output
  
   E sdl             SDL output device

  I just want record the audio from my mic, how to use command line to do it ?

• Call ffmpeg in c++ with system() function fails

  2 septembre 2014, par zhen lee

  I write a c++ program which needs to convert some(say:10) mp4 videos to flv videos.
  I use ffmpeg in my program for each video like this :

  system("ffmpeg -i video -filter:v yadif -ar 44100 -sameq -y -f flv temp.flv")

  however,it turns out :only first video will be converted successfully,the others will fail.
  it means :
  when i change the input order of which video to convert and re-execution the program,it behave the same:only the first video(will be different each time as i changed the input video order) will be converted successfully.

  The error message like :

  [h264 @ 0xaee0740] concealing 45 DC, 45 AC, 45 MV errors
  [h264 @ 0xaee0ce0] AVC : nal size 305665
  Last message repeated 1 times
  [h264 @ 0xaee0ce0] no frame !
  [h264 @ 0xaee1280] AVC : nal size 572993
  Last message repeated 1 times
  [h264 @ 0xaee1280] no frame !
  [aac @ 0xad9ccc0] channel element 0.13 is not allocated
  Error while decoding stream #0:1
  [aac @ 0xad9ccc0] channel element 0.13 is not allocated
  Error while decoding stream #0:1
  [aac @ 0xad9ccc0] channel element 0.13 is not allocated
  Error while decoding stream #0:1
  ......
  The most strange thing is :when i run ffmpeg command in bash shell,all video will be converted successfully .

  After google it,I have try these(certainly failed) :

  1. remove -sameq option,the result is same ;

  2. write ffmpeg commod in a shell script ConvertToFlv.sh like :

     /usr/local/bin/ffmpeg -i "$dir/$1" -filter:v yadif -ar 44100 -sameq -y -f flv "$dir/temp.fiv"

     then call this script in program like

     system("ConvertToFlv.sh"+video)

     or

     system("sh ConvertToFlv.sh"+video)

     The result is same.

  The ffmpeg configure is :

    ffmpeg version 0.9.1.git Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Dec 17 2012 16:17:30 with gcc 4.1.2 20080704 (Red Hat 4.1.2-48)
  
    configuration: --enable-gpl --enable-postproc --enable-nonfree --enable-postproc --enable-swscale --enable-avfilter --enable-pthreads --enable-libxvid --enable-libx264 --enable-libmp3lame --enable-libfaac --disable-ffserver --disable-ffplay
  
    libavutil      51. 41.100 / 51. 41.100
  
    libavcodec     54.  4.100 / 54.  4.100
  
    libavformat    54.  1.100 / 54.  1.100
  
    libavdevice    53.  4.100 / 53.  4.100
  
    libavfilter     2. 62.101 /  2. 62.101
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0.  7.100 /  0.  7.100
  
    libpostproc    52.  0.100 / 52.  0.100

  and my machine envirment is :

  Linux master 2.6.18-194.el5 #1 SMP Fri Apr 2 14:58:14 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux

  I’m irritable now,I hope someone can give me some advice,really appreciate it.

• Convert RTP packets to WAV or AU using ffmpeg

  14 octobre 2014, par Jonas Kongslund

  I have a file containing a sequence of RTP packets wrapped in UDP/IP packets. I want to convert this file to a WAV or AU file and was told that ffmpeg may be able to do the job. However the tool does not behave as I would expect. For some reason it is expecting an SDP file but I do not have such a file and I am wondering why it is needed since the RTP packets seem to contain enough information in order to do the conversion. Also it is reporting the wrong payload type.

  Any ideas ? Below is what I have tried. The RTP packets in the input file alaw.rtp only have payload types 8 (A-law) and 72 (RTCP related) so I do not know where payload type 105 is coming from.

  $ ffmpeg -f rtp -i alaw.rtp alaw.au
  
  ...
  
  [rtp @ 0x9dbdfe0] Unsupported RTP version packet received
  
      Last message repeated 89 times
  
  [rtp @ 0x9dbdfe0] Unable to receive RTP payload type 105 without an SDP file describing it
  
  [rtp @ 0x9dbdfe0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, rtp, from 'alaw.rtp':
  
    Duration: N/A, bitrate: N/A
  
  File 'alaw.au' already exists. Overwrite ? [y/N] y
  
  Output #0, au, to 'alaw.au':
  
  Output file #0 does not contain any stream

  This is the version of ffmpeg that I have used

  ffmpeg version 0.10.6-6:0.10.6-0ubuntu0jon1~lucid2
  
  built on Nov 12 2012 15:20:22 with gcc 4.4.3